550809 has 18 divisors (see below), whose sum is σ = 926250. Its totient is φ = 314496.

The previous prime is 550801. The next prime is 550811. The reversal of 550809 is 908055.

550809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 451584 + 99225 = 672^2 + 315^2 .

It is not a de Polignac number, because 550809 - 2³ = 550801 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550801) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 184 + ... + 1065.

2⁵⁵⁰⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

550809 is a deficient number, since it is larger than the sum of its proper divisors (375441).

550809 is a wasteful number, since it uses less digits than its factorization.

550809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269 (or 1259 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 550809 is about 742.1650759770. The cubic root of 550809 is about 81.9722789501.

The spelling of 550809 in words is "five hundred fifty thousand, eight hundred nine".